Paper 2025/2048
Time-Lock Encrypted Storage for Blockchains
, Category Labs, Category Labs, Category Labs, Category LabsAbstract
We introduce time-lock encrypted storage (tTLES), a storage service provided by blockchains. In tTLES, clients store encrypted values towards a future decryption time $\tau_{tgt}$ (measured in block height). The security of tTLES requires that a value is decrypted only if (i) the encrypted value is included in the blockchain, and (ii) the time $\tau_{tgt}$ has passed. This is crucially different from existing schemes, which only enforce either of these conditions but not both. We formalize tTLES, and present an efficient protocol that relies on (in a black-box manner) a threshold identity-based encryption scheme, and a recent batch threshold decryption scheme. Finally, we discuss various applications that will benefit from tTLES.
Metadata
- Available format(s)
-
PDF
- Category
- Cryptographic protocols
- Publication info
- Preprint.
- Keywords
- Encrypted StorageBlockchainsBTEIBETime LockBatch Encryption
- Contact author(s)
-
amitagar108 @ gmail com
babel @ cs cornell edu
souravdas1547 @ gmail com
bgilkalaye @ category xyz - History
- 2025-11-06: approved
- 2025-11-06: received
- See all versions
- Short URL
- https://ia.cr/2025/2048
- License
-
CC BY
BibTeX
@misc{cryptoeprint:2025/2048,
author = {Amit Agarwal and Kushal Babel and Sourav Das and Babak Poorebrahim Gilkalaye},
title = {Time-Lock Encrypted Storage for Blockchains},
howpublished = {Cryptology {ePrint} Archive, Paper 2025/2048},
year = {2025},
url = {https://eprint.iacr.org/2025/2048}
}
